Wifi Calling has been around for a number of years however, it seems that it is still a very unknown entity of the services you get from your cellular provider. In Canada, the "Big 3" Telus, Rogers, Bell, all offer this service
Wifi calling allows your phone to use your own existing wireless when at home for cellular calls.
You can learn more about it and set it up on your phone by following the instructions from your carrier below:
This should be a real game changer for you!